UFC 4-159-03
3 October 2005
Table 4-3. Recommended Ship Longitudinal Wind Force Drag Coefficients
VESSEL TYPE
CxwB
CxwS
Hull Dominated (aircraft carriers,
submarines, passenger liners)
0.40
0.40
Normal*
0.70
0.60
Center-Island Tankers*
0.80
0.60
Significant Superstructure
0.70
0.80
*An adjustment of up to +0.10 to CxwB and CxwS should
be made to account for significant cargo or cluttered decks.
The longitudinal shape function also varies over bow and stern wind
loading regions. As the wind direction varies from headwind to tailwind, there is an
angle at which the force changes sign. This is defined as θx and is dependent on the
location of the superstructure relative to midships. Recommended values of this angle
are given in Table 4-4.
Table 4-4. Recommended Values of θx
θx (deg)
LOCATION OF
SUPERSTRUCTURE
Just forward of midships
100
On midships
90
Aft of midships (tankers)
80
Warships
70
Hull dominated
60
Shape functions are given for general vessel categories below:
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